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United States Patent |
6,198,066
|
Thorne
|
March 6, 2001
|
Method and apparatus for radiated beam marking of a golf club part and such
part
Abstract
A method for treating the surface of a golf club part having a non-smooth
surface such as a part which has been cast. Preferably, in those instances
where the part is cast, the part is abraded for example by tumbling or by
directing a light sandblast against the part to create a low reflectivity
surface. Such abrading roughens the golf club part so that greater
contrast can be obtained using radiated beam treatment. Surface roughening
can also be created by acid etch or other suitable method. The club part
is mounted in a beam treatment station to permit projecting a radiated
beam on selected areas of the part's surface resulting in the momentary
and superficial melting or fusing of the surface which makes such areas
less rough and more light reflective than adjacent surface areas. Patterns
are formed by causing relative movement between the part and a high energy
heat source such as a radiated beam. Preferably the heat source or beam is
held fixed and the part mounted on a movable table. Table movement may be
controlled by a programmable computer, or other suitable arrangement.
Inventors:
|
Thorne; John K. (Prescott, AZ)
|
Assignee:
|
Sturm, Ruger & Company, Inc. (Southport, CT)
|
Appl. No.:
|
257367 |
Filed:
|
February 24, 1999 |
Current U.S. Class: |
219/121.17; 219/121.35; 473/324 |
Intern'l Class: |
B23K 015/00; A63B 053/04 |
Field of Search: |
219/121,17,121.35,121.66,121.85
473/324,409
|
References Cited
U.S. Patent Documents
3701880 | Oct., 1972 | Rively et al.
| |
4335295 | Jun., 1982 | Fowler.
| |
4547649 | Oct., 1985 | Butt et al.
| |
4727235 | Feb., 1988 | Stamer et al.
| |
4843207 | Jun., 1989 | Urbanek et al.
| |
4922077 | May., 1990 | Gordon et al.
| |
4972061 | Nov., 1990 | Duley et al.
| |
4974736 | Dec., 1990 | Okunuki et al.
| |
5264310 | Nov., 1993 | Kawai | 430/5.
|
5378512 | Jan., 1995 | Van Wyk.
| |
5420575 | May., 1995 | Cheraso et al.
| |
5632916 | May., 1997 | Lappalainen et al.
| |
5755626 | May., 1998 | Shira.
| |
5800285 | Sep., 1998 | Thorne et al.
| |
Foreign Patent Documents |
0773505 | May., 1997 | EP.
| |
6-305241 | Nov., 1994 | JP.
| |
Other References
Electron Beam Welding, p. 545, No Date Available.
|
Primary Examiner: Heinrich; Samuel M.
Attorney, Agent or Firm: Pennie & Edmonds LLP
Claims
I claim:
1. A method of treating a golf club part comprising
1) fabricating a golf club part of metal material in such a way that a
surface area lacks smoothness;
2) providing a radiated charged particle beam transmitter;
3) positioning the club part in an evacuated enclosure a selected distance
from the transmitter; and
4) transmitting a radiated beam charged particle against the part surface
area with selected intensity for a selected period of time to cause the
area to be more light reflective than such area is prior to beam
transmission.
2. The method of claim 1 in which the club part is fabricated by casting.
3. The method of claim 1 providing in addition positioning apparatus for
controlling the relative position between the beam and club part so that
selected areas of the part are made more light reflective than adjacent
areas.
4. The method of claim 3 in which the positioning apparatus includes a
programmable computer to control the positioning apparatus.
5. A method of treating a golf club part comprising:
1) fabricating a golf club part of metal material in such a way that a
surface area lacks smoothness;
2) abrading the fabricated golf club part;
3) providing a radiated beam transmitter;
4) positioning the club part selected distances from the transmitter; and
5) transmitting a radiated beam against the part surface area with selected
intensity for a selected period of time to cause the area to be more light
reflective than such area is prior to beam transmission.
Description
BACKGROUND OF THE INVENTION
Radiated beams such as electron or laser beams have been used to mark and
decorate metal objects (U.S. Pat. No. 4,335,295). Beam energy and the heat
generated alters the micro structure and light reflectance of the surface
and causes contrasts in the appearance of the metal surfaces.
Golf club heads fabricated by casting have had graphic designs created
dulling the casting process or thereafter by etching the club head surface
(U.S. Pat. No. 5,800,285).
SUMMARY OF THE INVENTION
Broadly, the invention comprises a method and apparatus for treating the
surface of a golf club part having a non-smooth surface such as a part
which has been cast. Preferably, in those instances where the part is
cast, the part is abraded for example by tumbling or by directing a light
sandblast against the part to create a low reflectivity surface. Such
abrading roughens the golf club part so that greater contrast can be
obtained using radiated beam treatment. Surface roughening can also be
created by acid etch or other suitable method.
The club part is mounted in a beam treatment station to permit projecting a
radiated beam on selected areas of the part's surface resulting in the
momentary and superficial melting or fusing of the surface which makes
such areas less rough and more light reflective than adjacent surface
areas. Patterns are formed by causing relative movement between the part
and a high energy heat source such as a radiated beam. Preferably the heat
source or beam is held fixed and the part mounted on a movable table.
Table movement may be controlled by a programmable computer, or other
suitable arrangement.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a metal golf club head including a partial hosel
marked in accordance with the present invention;
FIG. 2 is an elevational view of a radiated beam treatment station; and
FIG. 3 is a sectional view along line 3--3 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, a metal cast golf club head part 10 is fabricated by casting,
forging or other method. Part 10, particularly when cast, has a top
surface 11 which has sufficient irregularities that radiated beam
treatment produces markedly contrasting surface areas 8 and 9 in surface
11. Surface area 8 is the word "RUGER" in stylized letters and background
surface area 9 is the surrounding part surface within oval 7. Such
contrasting surface areas 8 and 9 are after treatment relatively rough and
relatively smooth with differing light reflection characteristics.
Turning to FIGS. 2 and 3, beam 24 creates graphic designs in surface 11
such as surface area 8 including the word "RUGER". Prior to such radiated
treatment, part 10 if its surface is not sufficiently rough after
fabrication, may be roughened or abraded to increase surface
irregularities in surface 11 by sandblasting, tumbling or other roughening
treatment using an abrasive material or acid.
The apparatus for treating the club parts, whether further roughened or
not, is a charged particle beam such as an electron beam station 18
including electron beam gun projector 19 mounted above computer numerical
control table 21 which in turn is mounted on station base 22 positioned
within enclosure 20. Enclosure 20 is evacuated by drawing a vacuum at
outlet 20e. Electron beam treatment must be carried out in a vacuum to
avoid oxidation of the anode (not shown) of gun projector 19. Preferably
beam projector 19 is stationary and X-Y control table 21, with parts 10
mounted in pallet 25 having part receiving recesses 23, moves to create
the desired graphic pattern in surface 11 of parts 10. Pallet 25 holds six
(6) parts 10a-f.
Alternatively, table 21 and part 10 mounted therein is held in a stationary
position and projector 19 moves to project beam 24 against selected areas
of the surfaces of parts 10. In either arrangement the relative movement
between beam 24 and parts 10 creates marks, numbers, patterns, designs,
signatures or other graphics on the part surfaces. The focus and width of
beam 24 is controlled by varying the distance of beam station 18 from
parts 10 and varying the energy in magnetic focusing coil 26. Beam 24 may
be focused from a pinpoint to a relatively wide beam of 1/16 of an inch or
under. Beam 24 may be energized intermittently depending on the graphics
desired.
Electron beam station 18 preferably includes an electron beam welding unit
manufactured by Cambridge Vacuum Engineering Ltd. distributed by Wentgate
Dynaweld Inc. More particularly, the welding unit is Model No. CW604
Serial No. M/C547. It operates between 5-60 kilovolts with a beam
intensity of 0.5-40 milliamps. and a beam focus current of 275-550
milliamps. The vacuum pulled in enclosure 20 is about 10 to minus 4
millibars. Table 21 is preferably an Allen Bradley Controller.
A programmable computer 30 positioned exterior to vacuum chamber 20
controls the movements of table 21. The computer also controls
characteristics of the projected beam 24 including its direction, width
and intensity.
The beam treatment of each surface area of each part 10 is controlled such
that selected surface areas melt momentarily and fuse to a degree that the
treated surface areas reflect more light than the adjacent untreated areas
thus highlighting the treated areas. Any beam including a laser beam may
be used provided the beam creates sufficient heat on surface 11 of part 10
to melt or fuse the treated area of surface 11 sufficiently so that when
the melted or fused area solidifies it reflects more light than an
adjacent untreated area. When a laser beam heat source is used, evacuation
is not required.
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